The risks are lower, but women who have sex with women can still pass on sexually transmitted infections.

Women who have sex with other women can pass on or get STIs. Know how to protect yourself.

Lesbians and bisexual women are not immune from sexually transmitted infections (STIs), and it's important not to be complacent about getting tested for them, according to Ruth Hunt at the charity Stonewall.

Sometimes, lesbian and bisexual women are told they don't need to be tested for STIs. This is not the case.

A survey of lesbian and bisexual women by Stonewall revealed half of those who have been screened had an STI.

"Any one-on-one contact, such as oral sex or using the same hand when touching yourself and then your partner, can put you at risk. Two women that are both menstruating are at a higher risk, too."

Tips for safer sex between women

If you're using sex toys, use a new condom for each partner or between penetration of different orifices (body openings). Sex toys should be washed with soap and water between sessions. Find out more about cleaning sex toys.

Avoid oral sex if either of you has any cuts or sores in the mouth or on the lips, or use a dental dam. A dental dam is a latex or polyurethane (very thin, soft plastic) square, of about 15cm by 15cm, which you can use to cover the anus or female genitals during oral sex. It acts as a barrier to help prevent sexually transmitted infections passing from one person to another.

Some infections can be transmitted by hands, fingers and mutual vulval rubbing. Wash your hands before and after sex.

Wear latex gloves and use plenty of water-based lubricant for vaginal and anal fisting.

Tips for bisexual women on safer sex with men

If you have vaginal, anal or oral sex with a man, use a condom. When used correctly, condoms protect against unintended pregnancy and STIs. In addition to using condoms, find out about the form of contraception that suits you best.

If you think you could be at risk of unintended pregnancy, you have the option of using emergency contraception (the "morning after" pill or an IUD).

The emergency pill is available from some pharmacies, GPs, contraception (family planning) clinics and some sexual health clinics. The IUD is available from contraception clinics, some sexual health clinics and some GPs.

Symptoms of STIs in women

Thrush

Thrush is caused by an overgrowth of yeast called candida. Symptoms may include vulval and vaginal itching, pain and soreness on penetration, burning when passing urine, and a thick, white discharge.

It's possible for women to transmit thrush during sex through touching and sharing sex toys. Thrush can be treated with medicated cream, pessaries and tablets, which can be bought from a chemist.

Syphilis

Syphilis is a bacterial infection that causes a painless ulcer, usually in the genital area. It will disappear on its own, but other symptoms may appear. These can include a rash on the body and swollen glands.

If it is not treated, syphilis can cause serious nerve and body organ damage later in life.

In its early stages, syphilis is extremely infectious and can be passed on by close skin contact during sex. Treatment is with antibiotic injections or tablets.